Final answer:
The molecular geometry that does not have a tetrahedral electron geometry and a trigonal pyramidal molecular geometry is trigonal planar.
Step-by-step explanation:
The molecular geometry that does not have a tetrahedral electron geometry and a trigonal pyramidal molecular geometry is trigonal planar. In a trigonal planar molecule, the central atom is surrounded by three bonded atoms and has no lone pairs of electrons. It has a flat, triangular shape.